2. Of the following sentences, which is a comma splice? a. The greenhouse effect is a term.
b. Describing the process by which the earth's atmosphere traps heat.
c. The sun's rays heat the surface and atmosphere of the earth, in so doing they make possible photosynthesis.
d. Photosynthesis is a process by which plants use light to convert carbon and water into carbohydrates this process is essential to the life of plants.

C. The sun's rays heat the surface and atmosphere of the earth, in so doing they make possible photosynthesis.

Explanation:

A comma splice simply refers to a common grammatical error which occurs when a comma is incorrectly used to join two independent clauses together to make one sentence.

A comma splice can be found in "The sun's rays heat the surface and atmosphere of the earth, in so doing they make possible photosynthesis".

In this case, the comma is used incorrectly to join the independent clauses together.

the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.